<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<style type="text/css">
			.d1 {
				display: inline-block;
				width: 200px;
				height: 200px;
				background-color: #00FFFF;
				/* text-align: center; */
				/* padding: 50px;
				box-sizing: border-box; */
			}
			.d2 {
				width: 100px;
				height: 100px;
				background-color: red;
				margin: 0 auto;
			}
		</style>
	</head>
	<body>
		<div class="d1">
			<div class="d2">
				1
			</div>
		</div>
	</body>
</html>
